GB1031145A - Improvements in or relating to audio-frequency amplifiers - Google Patents

Improvements in or relating to audio-frequency amplifiers

Info

Publication number
GB1031145A
GB1031145A GB2589664A GB2589664A GB1031145A GB 1031145 A GB1031145 A GB 1031145A GB 2589664 A GB2589664 A GB 2589664A GB 2589664 A GB2589664 A GB 2589664A GB 1031145 A GB1031145 A GB 1031145A
Authority
GB
United Kingdom
Prior art keywords
loud
speaker
network
transducer
circuit arrangement
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB2589664A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1031145A publication Critical patent/GB1031145A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
    • H03F1/36—Negative-feedback-circuit arrangements with or without positive feedback in discharge-tube amplifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/002—Damping circuit arrangements for transducers, e.g. motional feedback circuits

Abstract

1,031,145. Loud-speaker circuits. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. June 23, 1964 [June 26, 1963], No. 25896/64. Heading H4J. The diaphragm of a loud-speaker driven by a circuit arrangement including an amplifier is connected to a transducer which delivers a voltage corresponding to the acceleration of the diaphragm and this voltage is fed back degeneratively to the input of the circuit arrangement. Between the input of the circuit arrangement and the loud-speaker is a first network which emphasizes low audio-frequencies below the loud-speaker resonance frequency. In the negative feedback circuit between the transducer and the input of the circuit arrangement is a second network which attenuates high audio frequencies having a wavelength below half the perimeter of the loud-speaker. The transducer is preferably piezo-electric. The arrangement permits the diaphragm to move so that the sound pressure is proportional to the input signal over a given frequency band. The input signal at terminal 1 (Fig. 6) is amplified by a cascade amplifier 9, 10 and passes via first network I emphasizing low audio frequencies, to an amplifier 11 and loud-speaker 3. Sub -audio-frequency signals are reduced by a negative feedback path including a capacitor 31 and resistor 32. The loud-speaker 3 is provided with a piezoelectric transducer 4 and the output voltage from this is applied to the control electrode of a field effect transistor 20 which produces at its output 21 a voltage at a reduced impedance level. Transistor 20, together with resistors 22, 23, 24 are preferably incorporated in the loudspeaker 3. The transistor output voltage is applied to the second network II which integrates and thereby attenuates signals of wavelength below half the perimeter of the loud-speaker.
GB2589664A 1963-06-26 1964-06-23 Improvements in or relating to audio-frequency amplifiers Expired GB1031145A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL294600 1963-06-26

Publications (1)

Publication Number Publication Date
GB1031145A true GB1031145A (en) 1966-05-25

Family

ID=19754819

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2589664A Expired GB1031145A (en) 1963-06-26 1964-06-23 Improvements in or relating to audio-frequency amplifiers

Country Status (8)

Country Link
AT (1) AT246228B (en)
CH (1) CH433450A (en)
DE (1) DE1270614B (en)
DK (1) DK109209C (en)
ES (1) ES301362A1 (en)
GB (1) GB1031145A (en)
NL (1) NL294600A (en)
SE (1) SE302149B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2187607A (en) * 1986-03-05 1987-09-09 Malcolm John Hawksford Apparatus and method for driving loudspeaker systems
GB2196815A (en) * 1986-09-25 1988-05-05 David Robin Birt Motional feedback system for loudspeakers
GB2201318A (en) * 1987-02-12 1988-08-24 Udi Group Ltd Electromechanical transducer
US5438625A (en) * 1991-04-09 1995-08-01 Jbl, Incorporated Arrangement to correct the linear and nonlinear transfer behavior or electro-acoustical transducers
EP1051058A2 (en) * 1999-05-07 2000-11-08 Nokia Mobile Phones Ltd. Piezoelectric audio device and method for sound production

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA982055A (en) * 1972-09-11 1976-01-20 Toshiyuki Goto Sound reproducing system
DE2420689C3 (en) * 1974-04-29 1984-09-20 Arndt 7500 Karlsruhe Klingelnberg Method and arrangement for improving the properties of electrodynamic transducers by means of negative motion
DE3429147A1 (en) * 1984-08-08 1986-02-20 Friedrich 6650 Homburg Müller ARRANGEMENT FOR ACOUSTIC COUPLING OF SPEAKERS

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE451710A (en) * 1942-08-14
DE853298C (en) * 1950-08-01 1952-10-23 Bernhard Philberth Feedback dynamic loudspeaker
US2860183A (en) * 1954-02-01 1958-11-11 Conrad Ivan Willard Sound reproducing system

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2187607A (en) * 1986-03-05 1987-09-09 Malcolm John Hawksford Apparatus and method for driving loudspeaker systems
GB2187607B (en) * 1986-03-05 1990-03-21 Malcolm John Hawksford Apparatus and methods for driving loupspeaker systems
GB2196815A (en) * 1986-09-25 1988-05-05 David Robin Birt Motional feedback system for loudspeakers
GB2201318A (en) * 1987-02-12 1988-08-24 Udi Group Ltd Electromechanical transducer
GB2201318B (en) * 1987-02-12 1990-10-24 Udi Group Ltd Electromechanical transducer
US5438625A (en) * 1991-04-09 1995-08-01 Jbl, Incorporated Arrangement to correct the linear and nonlinear transfer behavior or electro-acoustical transducers
EP1051058A2 (en) * 1999-05-07 2000-11-08 Nokia Mobile Phones Ltd. Piezoelectric audio device and method for sound production
EP1051058A3 (en) * 1999-05-07 2004-09-29 Nokia Corporation Piezoelectric audio device and method for sound production

Also Published As

Publication number Publication date
DK109209C (en) 1968-04-01
CH433450A (en) 1967-04-15
SE302149B (en) 1968-07-08
DE1270614B (en) 1968-06-20
NL294600A (en)
AT246228B (en) 1966-04-12
ES301362A1 (en) 1964-11-16

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